nRF52840 Dongle Matter power optimization

RE: nRF52840 Dongle Matter power optimization

Kenneth — Tue, 04 Nov 2025 11:58:18 GMT

CONFIG_SERIAL setting impact UART in this case, no impact to I2C or SPI.

What is the idle current here? Maybe you can even upload the PPK2 trace.

Kenneth

RE: nRF52840 Dongle Matter power optimization

ady — Mon, 03 Nov 2025 16:43:14 GMT

Thanks for your answer but i have read all those articles already.

Unfortunately i cannot use CONFIG_SERIAL=n because i'm using I2C.

Another thing that may have an impact might be CONFIG_CHIP_ICD_ACTIVE_MODE_THRESHOLD. This one is set to 5000 ms standard and we also have CONFIG_CHIP_ICD_ACTIVE_MODE_DURATION = 300 ms which goes pretty close to what i'm seeing in ppk2 graph -> those spikes for 5,6 seconds.

I have tried to set CONFIG_CHIP_ICD_ACTIVE_MODE_THRESHOLD to 2500 ms but this just breaks all communication

Please point me to some detailed docs / examples about CONFIG_CHIP_ICD_ACTIVE_MODE_THRESHOLD, CONFIG_CHIP_ICD_ACTIVE_MODE_DURATION that can explain what are they doing.

My sensor should require about 7,2 - 7,3 uA at 2Hz sampling rate but from here to 33 uA there is a lot of space for improvement.

RE: nRF52840 Dongle Matter power optimization

Kenneth — Mon, 03 Nov 2025 12:22:22 GMT

Hello,

Not measure this myself, but you can check out the guides we have:
https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/test_and_optimize/optimizing/power.html
https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/protocols/matter/getting_started/low_power_configuration.html

Kenneth